TVWish
From MythTV Official Wiki
TVWish is an add-on program that allows the user to maintain large wishlists with thousands of requests for movies, series epiosdes and other shows so they will be automatically recorded if they appear in the user's TV lineup.
TVWish also supports importing lists live from a web URL, so that external critics and friends, when trusted, can put up pages with shows, and your box will record them.
The full list of features, documentation and tarball can be found at http://www.templetons.com/brad/myth/tvwish.html